一、概述
交流鼠(shu)籠式異(yi)步(bu)電動(dong)(dong)機如果直(zhi)(zhi)接起(qi)(qi)動(dong)(dong)會產生(sheng)(sheng)很大(da)沖擊電流，會對電阻及其負載(zai)造成沖擊，甚至危(wei)害電網(wang)安全運行(xing)。生(sheng)(sheng)產機械對電動(dong)(dong)機的(de)起(qi)(qi)動(dong)(dong)也有各種不同的(de)要求，有些需(xu)要平穩起(qi)(qi)動(dong)(dong)的(de)生(sheng)(sheng)產機械也不允許直(zhi)(zhi)接起(qi)(qi)動(dong)(dong)。
星-三角轉(zhuan)換起(qi)(qi)動(dong)(dong)，自藕變壓(ya)器降壓(ya)起(qi)(qi)動(dong)(dong)的(de)主要(yao)問題是(shi)起(qi)(qi)動(dong)(dong)過程中(zhong)起(qi)(qi)動(dong)(dong)電壓(ya)和(he)(he)運(yun)行(xing)電壓(ya)轉(zhuan)換時的(de)電流沖(chong)擊，對(dui)電網和(he)(he)機械(xie)產生沖(chong)擊，產生損害(hai)。應用(yong)晶閘管(guan)交流調壓(ya)技(ji)術的(de)固態(tai)軟起(qi)(qi)動(dong)(dong)器，是(shi)目(mu)前降壓(ya)起(qi)(qi)動(dong)(dong)方(fang)式中(zhong)合理(li)、先進的(de)起(qi)(qi)動(dong)(dong)方(fang)式。
二、工作(zuo)原理(li)
軟啟動調(diao)速實際上是—個(ge)(ge)(ge)晶(jing)(jing)閘(zha)管(guan)(guan)交流調(diao)壓(ya)(ya)(ya)(ya)(ya)(ya)器(qi)。改(gai)變晶(jing)(jing)閘(zha)管(guan)(guan)的(de)(de)(de)(de)(de)觸發角，就可調(diao)節(jie)晶(jing)(jing)閘(zha)管(guan)(guan)調(diao)壓(ya)(ya)(ya)(ya)(ya)(ya)電(dian)(dian)(dian)(dian)路的(de)(de)(de)(de)(de)輸出電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)。用軟起動(dong)器(qi)起動(dong)電(dian)(dian)(dian)(dian)機(ji)時：設置(zhi)一(yi)個(ge)(ge)(ge)初始(shi)電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)，晶(jing)(jing)閘(zha)管(guan)(guan)調(diao)壓(ya)(ya)(ya)(ya)(ya)(ya)電(dian)(dian)(dian)(dian)路的(de)(de)(de)(de)(de)輸出電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)就從這一(yi)點(dian)開始(shi)上升；設置(zhi)一(yi)個(ge)(ge)(ge)升壓(ya)(ya)(ya)(ya)(ya)(ya)時間，逐漸增加(jia)晶(jing)(jing)閘(zha)管(guan)(guan)調(diao)壓(ya)(ya)(ya)(ya)(ya)(ya)電(dian)(dian)(dian)(dian)路的(de)(de)(de)(de)(de)輸出電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)，電(dian)(dian)(dian)(dian)機(ji)逐漸加(jia)速；設置(zhi)—個(ge)(ge)(ge)限(xian)(xian)流倍數，根據電(dian)(dian)(dian)(dian)流互(hu)感(gan)器(qi)測得的(de)(de)(de)(de)(de)實際電(dian)(dian)(dian)(dian)流值，控(kong)制晶(jing)(jing)閘(zha)管(guan)(guan)調(diao)壓(ya)(ya)(ya)(ya)(ya)(ya)電(dian)(dian)(dian)(dian)路的(de)(de)(de)(de)(de)輸出電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)，使電(dian)(dian)(dian)(dian)機(ji)的(de)(de)(de)(de)(de)實際電(dian)(dian)(dian)(dian)流不超過(guo)限(xian)(xian)流值。這樣在整個(ge)(ge)(ge)起動(dong)過(guo)程(cheng)中(zhong)，軟啟動(dong)柜的(de)(de)(de)(de)(de)輸出是一(yi)個(ge)(ge)(ge)平滑的(de)(de)(de)(de)(de)升壓(ya)(ya)(ya)(ya)(ya)(ya)過(guo)程(cheng)（且具有限(xian)(xian)流功(gong)能(neng)），直到(dao)晶(jing)(jing)閘(zha)管(guan)(guan)全導(dao)通，電(dian)(dian)(dian)(dian)機(ji)在額定電(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)(ya)(ya)(ya)下工作(zuo)。

典型應用簡介
水(shui)泵：利用泵控制功能，在起動和停止時(shi)，減(jian)少液流沖擊所產(chan)生的泵流水(shui)錘現象，節省了系統(tong)維修(xiu)費用； 
球(qiu)磨機(ji)：利(li)用電壓斜坡起動，減少齒輪轉(zhuan)矩的磨損(sun)，減少維修工作量延(yan)長使用壽命(ming)； 
風機(ji)：利用固態軟起動器取代了傳統起動器，減(jian)少皮帶磨損和機(ji)械沖擊； 
壓(ya)縮機：利用限流(liu)，實現(xian)了平(ping)滑(hua)起動(dong)，降低電機溫升； 
破碎機：利用堵轉保(bao)(bao)護(hu)和(he)快(kuai)速保(bao)(bao)護(hu)，避免機械(xie)故障和(he)阻(zu)塞造成電動機過熱而燒毀； 
輸送機械：利用軟起動和軟停機控(kong)制，實(shi)現平滑漸進的起動過程(cheng)和平滑減(jian)速的停車過程(cheng)，避(bi)免了(le)因沖擊而對物料和設備(bei)造成的損(sun)傷.